Monolithic Power Systems Inc. MPM3833CGRH-Z

Overview

MPM3833CGRH-Z from Monolithic Power Systems is an ultra-small, ultra-low-noise 3A step-down power module with integrated MOSFETs and inductor, operating from 2.75V to 6V input and delivering adjustable output down to 0.6V. It achieves <10mV output ripple in forced CCM mode with only four external components and is qualified for FPGA, ASIC, and optical module power delivery.

For engineers reviewing the MPM3833CGRH-Z datasheet, MPM3833CGRH-Z pinout, MPM3833CGRH-Z application, or MPM3833CGRH-Z equivalent, key selection criteria include its QFN-18 (2.5mm×3.5mm) footprint, 100% duty-cycle dropout capability, EN/PG sequencing support, ±10% power-good window, and EN55022 Class B EMI compliance.

Technical Context

The MPM3833CGRH-Z employs constant-on-time (COT) control with input voltage feed-forward to maintain stable switching frequency across 2.75–6V input and 0.6–6V output ranges. Its internal 1μH inductor and dual-MOSFET power stage enable forced continuous conduction mode (CCM) operation, ensuring low output ripple (<10mV with single 22μF output cap) and fast transient response.

It integrates cycle-by-cycle over-current protection (6A peak P-FET / 1.5A valley N-FET limits), hiccup-mode short-circuit recovery, thermal shutdown at 160°C, and precision power-good monitoring with ±10% FB threshold window and 100μs delay-enabling robust power sequencing in space-constrained systems.

Key Specifications

Pinout & Package

MPM3833CGRH-Z is housed in an ultra-compact QFN-18 package measuring 2.5mm × 3.5mm × 1.6mm with exposed thermal pad (PGND-connected) for efficient heat dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with TSM1033S and RTM2015B, MPM3833CGRH-Z uniquely combines QFN-18 miniaturization, COT-based fast transient response, integrated PG signaling, and 100% duty-cycle capability-making it optimal for space-constrained, noise-sensitive, and multi-rail sequenced systems.

Availability

MPM3833CGRH-Z is available at Aetrix Electronics and suitable for FPGA core power, optical transceiver bias, and SSD controller rail applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPM3833CGRH-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs and modules, with design centers in the US, China, and Taiwan.

The MPM3833C product line delivers ultra-compact, low-noise power modules targeting space- and noise-constrained applications including optical communications, portable computing, and high-speed digital logic.

FAQ

What is the minimum output capacitor value required for stable operation?

The MPM3833CGRH-Z is characterized with 22μF ceramic output capacitance for 1.2V/2A operation. For outputs ≥2.5V, 47μF is recommended to ensure stability and meet ripple targets. Using less than 10μF risks loop instability and excessive voltage deviation under load transients.

Does the device support automatic power sequencing with other rails?

Yes-its dedicated EN and open-drain PG pins enable precise control of startup order and fault propagation. PG asserts high only when FB is within ±10% of regulation, allowing downstream regulators to be enabled only after stable output is confirmed.

Can the MPM3833CGRH-Z operate with input voltage equal to output voltage?

Yes-it supports 100% duty-cycle operation, allowing VIN = VOUT (e.g., 3.3V in → 3.3V out) without dropout or regulation loss. This is enabled by its synchronous rectifier architecture and COT control scheme.

How is thermal performance validated in the QFN-18 package?

Thermal resistance is measured per JESD51-7 on a 2-layer evaluation board (EVM3833C-RH-00A): θJA = 42°C/W and θJC = 13°C/W. At 3A/5V input, junction temperature rise is ~100°C above ambient-well within the 150°C max rating when using proper copper pour and thermal vias.

Is the FB pin internally biased, and what is its input current?

The FB pin has a precision 600mV reference with typical input current of 10nA. This ultra-low bias enables use of high-value resistors (e.g., 200kΩ/100kΩ for 1.8V) without compromising regulation accuracy or noise immunity.

What protection features activate during a short-circuit event?

Upon short-circuit detection, the device enters hiccup mode after 100μs of consecutive current-limit triggering: it disables the power stage, discharges the soft-start capacitor, then attempts automatic restart. This limits average power dissipation and prevents thermal runaway.

Does the part require external compensation components?

No-its constant-on-time control architecture is inherently stable and does not require external compensation networks. Only FB resistors, input capacitors, and output capacitors are needed, simplifying design and reducing BOM count to four total components.